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Where the same amount of phosphorus 29 pounds of the element per acre per annum was used in connection with other minerals 300 pounds of potassium sulfate and 100 pounds each of the sulfates of magnesium and sodium the average yield of potatoes was 109 bushels.
The salts are sulfates, phosphates and chlorides of sodium, potassium, calcium and magnesium. The organic and inorganic matter varies with the ration. The quantity of urine secreted within a given time varies in the different species and at different times in the same individual.
Even in soils abundantly supplied with potassium temporary use may well be made of soluble potassium salts when no adequate supply of decaying organic matter can be provided. For this purpose, kainit which contains potassium and also magnesium and sodium in chlorides and sulfates is preferred to the more concentrated and more expensive potassium salts.
The urine secreted by the kidneys is a body excretion, and consists of water, organic matter and salts. The nitrogenous end-products, aromatic compounds, coloring matter, and mucin form the organic matter. The nitrogenous end-products and aromatic compounds are urea, uric and hippuric acids, benzoic acid and ethereal sulfates of phenol and cresol.
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